/prəˈɡrɛsɪv ˌjunəfɪˈkeɪʃən ʌv lɔː/ – Phrase
Definition: Tiến triển hợp nhất pháp luật.
A more thorough explanation: the process by which laws from different jurisdictions are made more similar
Example: The statutory mission of the Hague Conference on Private International Law is to work for the progressive unification of the law of international trade.